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Check the balance and fade functions on the radio. Then put the amplifier over the board and drill in the screws to mount it. You usually have to line the enclosure with dense flexible foam or fiberglass insulation which will allow you to achieve the level of damping that is necessary for a good-sounding box.
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Your battery has the power to burn your vehicle up if an unfused power wire is shorted to ground. You should also remember that you cant get it wet, so if you're designing a system for your boat, you'd better find something else instead. 5" x 12. Remove the speaker and drill pilot holes. Installing an amplifier is a complex job that requires work throughout the car to connect and route the cables and to mount the amplifier.
Here is where you learn how to connect the speaker wires.
1. First of all, you have to run speaker wire from the amplifier to the speakers and/or subwoofers that the amplifier will be powering into. If you will be powering the speakers that are already in the vehicle, it's usually easier to run the speaker wire from the back of the radio when you are connecting the audio and remote turn-on cables. Then you have to route the speaker wire along with the audio cable and remote turn-on wire.
2. When you connect the speaker wire to your speakers or subwoofers, you have to be careful to keep the polarity consistent. The speakers will be out of phase and will cancel out each other's signal if you do not connect the positive wire on each speaker to the positive terminal of the amplifier. Usually, one strand of the speaker wire is silver and the other bronze, so you can easily make the right connection.